NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026
The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2023-12-15 | 661-642 | 0–9 XXXall 10 · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | DELANO | CA |
| 2022-07-20 | 661-610 | 0–9 XXXall 10 · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | BKFD MAIN | CA |
| 2021-11-12 | 661-581 | 0–9 XXXall 10 · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | PLDL PLDL | CA |
| 2012-08-07 | 661-446 | 0–9 XXXall 10 · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | DELANO | CA |
| 2010-03-12 | 661-385 | 0XXX1XXX2XXX6XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | EDWARDS | CA |
| 2007-06-11 | 661-368 | 0–9 XXXall 10 · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | BKFD NORTH | CA |
| 2002-08-21 | 661-679 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | BKFD NORTH | CA |
| 2001-05-01 | 661-998 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | PLDL PLDL | CA |
| — | 661-565 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | BKFD MAIN | CA |
| — | 661-568 | 0–9 XXXall 10 · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | SNCA NHCS | CA |
| — | 661-600 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | SNCA NHCS | CA |
| — | 661-802 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | LANCASTER | CA |
| — | 661-839 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | PLDL PLDL | CA |
| — | 661-912 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | BKFD MAIN | CA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.